Automobile brake mechanism



Dec. 20, 1927.

H. S. HART AUTOMOBILE BRAKE MECHANISM Filed July 12. 1926 2 Sheets-Sheet gmmw oc 3 5 I m anoonu o witmaoo Aw Mia/V924 Dec. 20, 1927. 7 1,653,277

H. s. HART AUTOMOBILE BRAKE MECHANI SM Filed July 12. 1926 2 Sheets-Sheet 2 ill Patented Dec. 20, 19 27.

* UNITED STATES".

HERBERT s. HAR or PATENT I-OFFIC'E.

SAN A TONIO, TEXAS.

AUTOMOBILE BRAKE MECHAN SM.

Application filed July 12,

p The invention relates primarily, to a new and improved brake mechanism adapted for use on a well known term of passenger'machine or truck-in placegofthe usual cast iron I brake shoes of the hubbrakes and the brake band 'ofthe transmission brake. f

It is one object of the invention toprovide a new and improved construction and'arrangement of parts which may be quickly and easily installed and will be highly efficient in operation, provision being made whereby the braking actlon is eftected 'by rear portion of the brake mechanism applied to the rear axle 1 and a ssociatedpart's of a senger vehicle, of a late-design. t

Figure 2 is a detail perspective view illustrating the mannerot applying certain part s upon older modelsof the same make fo-fimm chine. Y Figure 3 is a sectional view-on 1ine"33 of-Fig. 1.' g V Figure 4 isa detail edge view as indicated by lineH-of Fig.3. I s Figure 5-is aperspectivee' view similar'to Fig. 1 but showingfithe arrangement used upon a'truck rather'than a passenger vehicle." a

Figure 6 is a sectional 'viewon line 6-6 Figure '7 is a detail edge view as indicated by lin'e 7'7 of Fig, 6. o

Figure 8' is a small perspective view showingthe relation ofparts associated with the usual-transverse controller shaft, the hand lever thereof, and the 'foot 'brakepedal;

, Figure 92iS E1I1 enlarged-perspective view "of parts seen iii-Fig.- 8; a p a s The "character A" designates the rear "axle of anautomobilegtheends :of :said axle having outstanding fiangesF, to whichthe rear radius rods R are connected by bolts Bl These flanges also'bearryf the; rear sprin" (stat stician)"and ordinarily, roe

pas-

use Serial No. 121,968.

shafts toroperating therearbrake shoes,

- pass through the openings 0 of said flanges.

Due to the natureof my inventiomhowever, these rockshafts are el m nated and s1m1larly, the cast iron brake shoes are not used.

Certain openings through the flanges F, commonly receiving fastening means for portions of the rearjhub brakes,'1 utilize to receive bolts 13, These bolts and the lowermost of. the bolts 13 are employed to secureplateslO to the flanges F, said plates projecting rearwardly from said 1 flanges and having lateral portions 11 which are receivable insaddles 12 on brake bands 13,-any desired adjustable connections such as those commonly used, being employed between said saddles '12 andthe lateral portions 1 11 0f the-plates 10, permitting the rear portions of the brake-bands to he adjusted to thed'esired extent toward the brake drums. These drumsare indicated at 13, and they are secured 'to' the rearwheels W in any desired manner.

In addition to performing the; functions above described, I utilize the bolts B for'securingtherearends of upper and lower, forwardly converging arms 14, to the flanges F.- The front'ends of these arms oi erlap each other and are formed with registering slots' le. Vertical plates 16 are anchored tothe slotted ends of the arms :14, by clamping bolts-17 whichpass through said-plates and =through+the slot/s15. The lower ends of theaplat'es 16 are formed with laterally "projecting-lugs-18 which are disposed under lugs 1 9-onthe upperendsot the brake bands 13.- Bolts 20 pass through alined openings in the lugs 18/and-19 and have'adjus'ting nuts 21, threaded "on their upper ends, the,

lower ends of said boltsbeingpro'vided with alpfpropri ate-shoulders 22 which are disposed under" the lugs 18. Coiled, compression --springs -23, surround the bolts 20 between the lugs 18-and 19,"said springs actingeupwardly, against said lugs 19 i to normally raise the upper portions of the brakeibands 13"from 'thedrums13, and the upward movement of the-bolts 20, lugs 19 and T said upper portionsot" the bands 13 is-limited by engagement of the shoulders 22"with the '-lugs-18. v

Two, transversely ali-ned, :ro'ckshafts 124 are provided infront of theflaxle A, the outer-ends of these shafts beingprovided with appropriate heads 25-to Wh "hthe lower ease of bolts and the ends of e the brake bands 13 are pivoted, as indicated at 26 and 27 resuectively.

It will be seen from the above that when the brakes are released, engagement of the shoulders 22 with the lugs 18, limits the inward movement of the brake bands, that is the lower portions thereof, toward the brake drums. Adjustment however of these lower portions is necessary as wear takes place,

. and when any such adjustment is required,

the bolts 1? may be loosened. Then, the plates ldand their lugs 18 may be readily adjusted to any desired extent, as occasion may dictate, some pivotal movement of the arms it about the bolts B, being then necessary. iVheu the proper adjustments are made, tightening of the bolts 17 will lock the parts in adjusted position. Adjustment of the upper ends of the brake bands toward the drinns, is controlled by means of the nuts 21. in the usual way.

Suitable supports 28 are provided for the inner ends of the shaftsfl l, said supports being bolted to the differential housing H or to some adjacent part, by bolts already found thereon. These inner ends of the shafts 2a are provided wlth upstanding arms 29 having hooks S at their upper ends, the bills of these hooks being rearwardly directed and having openings 31. A transverse equalizer 32 is formed with openings 33 rather loosely receiving the hooks 30, and a brake rod 3st extends forwardly from the center of this equalizer. Spring devices 35 of any desired form and anchored to the machine in any adequate 11121111181,'E\I6P1'0- vided to normally pull the equalizer 32 and the arms 29 rearwardly, assisting in holding the brakes iu expanded condition and also preventingrattling. These devices 35 have hooks 36 which are hooked into the openings 31, so that said devices are not only effectively connected with the arms 29 but serve to prevent possible, accidental upward move ment of the equalizer 32 from the hooks 30. To hold said equalizer against downward shaking upon the arms 29, the latter are preferably provided with stops 37 underlying said equalizer.

The rods 34 may lead directly forward to controlling means yet. to be described, or may be connected with a leverage-changing arm 38, as shown in Fig. 5, said arm being suitably pivoted upon a known part of the machine and having openings 39 for adjustment of said rod. Another rod 34 is pivoted to and extends forwardly from the lower end of the arm 38 to the means just alluded to.

The controlling means for the rod 34: or 34, as occasion may be, is illustrated in Figs. 8 and 9. Tell known portions of the machine, either truck or passenger vehicle, are illustrated. T designates the transmission, P has reference to the usual brake pedal which customarily operates a brake within the transmission casing, S designates the usual controller shaft having the hand brake lever L, and C indicates the arm on the shaft S which is instrumental in throwing out the clutch, when the lever L is pulled rearwardly.

The pedal P does not operate a transmission brake when my invention is installed in the preferred manner, as the transmission brake band is then removed. If desired, however, it will be understood that'this band could be left in place and allowed to function. I

The shaft 53 is usually instrumental in applying the ordinary hub brakes to the rear wheels, but as said hub brakes are omitted, this shaft is instrumental only in effecting contraction of the brake bands 13 and in throwing out the clutch when the machine is to stand idle.

A brake-applying member 40 is pivotallv mounted upon the shaft S and has its lower end pivoted at 4-1 to the front end of the rod 34; or 8 1, openings 42 being provided for adjustment. The upper end of this member 40 is slidably connected with the rear end of a link S, the front end of this link being pivoted at n to an extension arm 45, the latter being suitably secured at as to the brake pedal P and projecting downwardly below the pivot of said pedal.

The sliding connection betweenthe link l3 and the member 40, is such that upon forward movement of the pedal P, said member 40 will be rocked in a direction to pull upon the rod 34: or 34: for the purpose of applying the brakes. Provision is made however whereby the member 40 may be moved in brake-applying direction by turning of the shaft S, so that the brakes may be set simultaneously with throwing the clutch out when the i'nachine is to stand. Then, the above-named sliding connection functionsto permit the necessarymovement of the member 4-.0' without moving the" pedal Pin brake-applying direction. This is of particular advantage when this pedal is connected, for instance, by the usual wire V, with a switch for operating a stop light.

In the preferred construction, herein disclosed, the member 40 includes upper and lower sections 47 and 48, both notched to receive the shaft S, as indicated at 49. A notched plate 50 is also preferably included in the formation of said member lt) and prevents any canting of said member upon'the shaft; lhe sections 47 and 48 and the plate 50 are secured together by appropriate bolts 51, and the uppermost of these bolts is disposed in the rearward path of the arm 0. Thus, when lever L is operated to turn the shaft S in a direction to throw out the and thus turns the member v40 in brake-aplUU plying direction. VVhen' the parts arein normal running position, the arm G is in advance of the upper bolt 51 and depression of the brake pedal P to apply the brakes, moves the member 40 in such a direction as to cause said upper'bolt 51 to move rearwardly away from the arm C, Thus, it

will be seen that the l-everL may be utilized to apply the brakes and "throw out the clutch without afiecting the foot pedal P. Similarly, this foot pedal may be employed to apply the brakes without effecting any movement of the shaft S.

The member 40 may be held in proper relation with the arm 0 by any desired means. For this purpose, I prefer to employ a collar 52 clamped upon the shaft S by a bolt 53. This collar and the sections of the, member 10 maybe readilyapplied to the shaft S without the necessity of dismounting the latter. I

The slidable connecti on above referred to, between the link a3 and the upper end of the member 40, preferably comprises two all longitudinally slotted arms 5d at the rear end of the link, anda bolt or the like 55 passing through said slots and through the upper end of the member 40. A series of openings 56 maybe formed in this member 40 for purpose of'adjustment if. de

sired, and adjusting nuts 57 may alsoibe employed to permit longitudinal adjustability of the link 4:3.

It will be seen from the foregoing that rather simple, easily applied and eiiicient brake mechanism has been provided, for the purposes lntended, and whilethe details herein disclosed have proven efiectlve in actual use, it is to be understood that within the scope of the invention as claimed, varia-i tions may be made.

, I claim "In an automobile brake mechanism, upper and lower arms converging forwardly and having their front ends overlapped and formed with registering slots, the rear ends of said arms being formed with openings to receive attaching fasteners a vertical plate contacting with one of said front ends, a bolt passing through said plate and through said slots, said bolt normally securing said plate tosaid arms andwhen' loosened permitting vertical adjustment of the plate, a lug projecting laterally from the plate and'having an opening, a brake band having a lug at one end spaced above the first named lug and also formed with an opening, a bandadjusting bolt passing through said lug openings and having a shoulder under the first named'lug, a bandcontractlng member connecting the lower end of said bolt with the lower end of the brake band, an ad usting nut on the upper end of the bolt resting upon the lug of the brake hand, and a band-expanding spring surrounding the bolt between the two lugs, said sprinnthrustin upwardly on the bolt to normally hold its shoulder againstithe lower side of said first named lug, whereby vertical adjustment ofthe aforesaid plate and its lug will effect vertical adjustment. 

